<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
      <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabsleave" @tab-click="tabClicked">
        <el-tab-pane label="基本信息" name="0">
          <el-form-item label="商品名称" prop="goods_name">
            <el-input v-model="addForm.goods_name"></el-input>
          </el-form-item>
          <el-form-item label="商品价格" prop="goods_price">
            <el-input v-model="addForm.goods_price" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品重量" prop="goods_weight">
            <el-input v-model="addForm.goods_weight" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品数量" prop="goods_number">
            <el-input v-model="addForm.goods_number" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品分类" prop="goods_cat">
            <el-cascader expand-trigger="hover" v-model="addForm.goods_cat" :options="cateList" :props="cateProps" @change="handleChange"></el-cascader>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品参数" name="1">
        <!-- 渲染表单的item项 -->
          <el-form-item :label="item.attr_name" v-for="item in manyTabData" :key="item.attr_id">
            <!-- 复选框组 -->
            <el-checkbox-group v-model="item.attr_vals">
              <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
            </el-checkbox-group>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品属性" name="2">
          <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
            <el-input v-model="item.attr_vals"></el-input>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品图片" name="3">
          <!-- action为图片上传的服务器地址 -->
          <el-upload action="http://127.0.0.1:8888/api/private/v1/upload" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headersObj" :on-success="handleSuccess">
          <el-button size="small" type="primary">点击上传</el-button>
          <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
        </el-upload>
        </el-tab-pane>
        <el-tab-pane label="商品内容" name="4">
          <!-- 富文本编辑器 -->
          <quill-editor v-model="addForm.goods_introduce"></quill-editor>
          <!-- 添加商品按钮 -->
          <el-button type="primary" class="btnAdd" @click="goodsAdd">添加商品</el-button>
        </el-tab-pane>
      </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%" class="previewImg">
      <img :src="previewPath" alt="">
    </el-dialog>
  </div>
</template>

<script>
// 导入深拷贝需要的包
import _ from 'lodash'

export default {
  data () {
    return {
      //   默认激活索引为0
      activeIndex: '0',
      // 添加商品的数据表单
      addForm: {
        goods_name: '',
        goods_price: '0',
        goods_weight: '0',
        goods_number: '0',
        // 选中的商品id数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品内容介绍
        goods_introduce: '',
        // 动态参数静态属性
        attrs: []
      },
      // 验证对象
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请选择商品分类', trigger: 'blur' }]

      },
      // 商品分类数据
      cateList: [],
      // 配置级联选择器
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数数组
      manyTabData: [],
      // 静态属性数组
      onlyTabData: [],
      // 设置文件上传的请求头
      headersObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 预览图片的url
      previewPath: '',
      // 图片预览对话框的显示与隐藏
      previewVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类信息失败！')
      }
      this.cateList = res.data
      console.log(this.cateList)
    },
    // 级联选择器变化的时候触发的事件
    handleChange () {
      console.log(this.addForm.goods_cat)
      // 只允许选中三级分类
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // 监听标签页切换事件
    beforeTabsleave  (activeName, oldActiveName) {
    //   console.log('即将离开的标签页是：' + oldActiveName)
    //   console.log('即将进入的标签页是：' + activeName)
    //   return false
      if (this.addForm.goods_cat.length !== 3 && oldActiveName === '0') {
        this.$message.error('请先选择商品分类!')
        return false
      }
    },
    // 点击tab触发的事件
    async tabClicked () {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败！')
        }
        // 将获取到的attr_name从字符串转化为数组
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTabData = res.data
        console.log(this.manyTabData)
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败！')
        }
        // console.log(res.data)
        this.onlyTabData = res.data
      }
    },
    // 文件预览触发的事件
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 文件移除触发的事件
    handleRemove (file) {
      // 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 查找此图片的索引
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 从图片数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 文件上传成功时
    handleSuccess (response) {
      // 拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 将图片信息对象push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    // 添加商品
    goodsAdd () {
      // 表单验证
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项！')
        }
        // 执行添加的业务逻辑
        // 如果直接操作this.addForm 会影响form-item 里面双向绑定的数据
        // lodash cloneDeep(obj)
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTabData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTabData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)
        // 发起请求添加商品
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败！')
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
    margin: 0 10px 0 0 !important;
}

.previewImg {
  width: 100%;
}

.btnAdd {
  margin-top: 15px;
}
</style>
